Apparatus for extracting liquid from material



June 13, 1933. H. SKOLDBERG APPARATUS FOR EXTRACTING LIQUID FROMMATERIAL Filed Jan.

21, 1928 3 Sheets-Sheet 1 9 W AM...

APPARATUS FOR EXTRACTING LIQUID FROM MATERIAL H. SKCSLDBERG 1,913,641

Filed Jan. 21, 1928 3 Sheets-Sheet 2 nvwwrae June 13, 1933. H. SKGLDBERG1,913,641

APPARATUS FOR EXTRACTING LIQUID FROM MATERIAL Filed Jan. 21, 1928 3Sheets-Sheet 3 p. IIIIIIIII'I I II IIIIII'IIIIIIIIIIIIIJ IIII 'IIIIIIPatented June 13, 1933 j UNI ED seems PATENT OFFICE nanny sxonnnnneg ors ocKHbLM, swnnnn APPARATUS rose mrrnacrme nrenrn rnonrim'rnninnApplicatien fiIecIJanuary 21, 1923, Serial No. 248,553; and in$weclenlan 1ary 2 9, i927.

This invention relates to the extraction of liquid by mechanical meansfrom masses of material which consist of very finelydivided, especiallycolloidal, substances, such as peat.

Experiments, which have been made during the last few years, however,have shown that water contained in peat may extracted a much greaterdegree than hitherto was a thought to be possible. practical method L9howeverhas not been obtained for the reason that the sieve employed hasshown a tendency to become choked by the material, the outer layer ofwhich has parted with its content .of liquid that has been abstracted bythe preee sure used, the material being transformed into alayerimpenetrable to the liquidl The result is that the content of liquid hasbeen augmented toward the middle-of the mass or material, which ispressed in one stage. Moreover it has been shown necessary to with theaid of which the material being pressed is enclosed at the same time asit transmits the liquid. e I The invention to be now described has forobject to obviate these inconveniences to the greatest possible extent,and it is characterized thereby, that the superficial layer of the massabutting against the sieve, having been finally treated or pressed andbeing rendered impenetrable to the liquid, is prevented from remainingon one-and the same spot of the sieveduringthe pressing operation beingdisplaced by other parts of the mass which are not finally treated orpressed. For this purpose the sieve tandthe mass are caused to move inrelation to one another in such a man: nerthat a superficial layer iscaused tobe mixed with those inner parts of the mass which are'morerichin water. Devices ,for this purpose may be constructed ,in various ysa at The movement bet'ween ;the material being pressed and the sieve shouldbe effected in an inclined direction over the sieveand thesieve consistof: parallel spaces ofsucha width that mainly only the liquid squeezedout from the pressgoods is transmitted but'no part of the materialitself. e v

In the accompanying drawings clean the sieve aftereachpressingoperation,

Figures 1-3 illustrate diagrammatically constructional forms of a pressaccording to theinvention,

Figure 1 being a horizontal section of the pres Figure 2 is a transversesection of the same with'a modified arrangement of the sieye, and

F gure 3 and 3a illustratingin transverse section on a larger Scale twodiiierent sieve devices. e i i i t i u .4 is llwr z l plan p y nhorizontal section of a inodilied construction and Figure 5 is avertical view partly in section of Figured, A V

Figure 6shows a further medifiedarrangementin vertical section, while"Figure 57 is ahorizontalsection of. Figure 6 except 'that longitudinallaniinaeb are used in place or discs 6 shown in Figure 6,

Fi .ure8is a fragmentary yiew of Figure 6 toa argerscale. i

The mass .tobe pressed is introduced at one end of the press at l andiscaused to move in aspiral through the press chamber 3 by means ,of atransporting and pressing device 2,whereby it pressed during its advancng motion againstthe sieve, constituting the peripheral limitation ofthe press chamber. The material after being pressed is iorced outthrough the oppositefend ofthe press at 4, the

eing regulated bymeansof an e itpp ne adjustable body ,5.

The sievefwhich in this-case isstationary,

consistsof discs 6, Figure 1, or longitndinal b F su fiirl eb i e y ie nto one another. Thediscs 6 "asshown in Figure 1 abut against each otheron theirinner V periphery and are held inposition by aseriesoflongitudinalbars 7 en said peri herythe outer peripheryengaging bars8.

.barsd areused theyare' inserted in between rings 7 and ISwhich arelsocketed to .nzceive the ends ofthe bars as shown in the upper part ofFigure 3 or merely resting between the rings as shown in Figure" 3a,there heldassembled by means of rings 9) The discs 6 or bars 6 arearranged soft-hat between them spaces 10, of a desiredor requisite widthare :formed, said spaces, if desired, 'flaring towards a surroundingchamber 11, wherein i hen the 9 annular stays 12 are provided betweenthe ring 8 or the bars 8 and the outer casing 13 of the press. Theessential features of the bars 6 or the discs 6 consists therein thatthey are arranged at such an angle to the direction of the pressure thatthe pressure within the press chamber 3 against the surfaces of the barsor discs facing each other tends to diminish the width of the spacebetween them, whereas a pressure on the opposite side of the sieve fromthe chamber 11 tends to augment the width of said space. The bars 6 orthe discs 6 are therefore not immovably secured to their support (7, 7 8or 9) but are secured in such a manner that they have a limited amountof movement. r

In order to free the spaces from pressed material which may beobstructing them and withoutappreciably disturbing the working of thepress, liquid or air under pressure may be introduced into the chamber11 through the pipe 14 and its branch pipes 15. The pressure of saidliquid or air ought to be higher than the pressure prevailing in the isa rotating member.

chamber 3, so that it will be able to open the spaces 10 and thus blowout or scavenge any obstructing material. Such an obstruction may beoccasioned thereby that the spaces 10 from the beginning have a toogreat width, so that the material maybe introduced by the pressure intosaid spaces.

The pipe 16 and its branches 17, opening into the chamber 11, serve todrain the water or other liquid from the press goods.

Figures 4 and 5 show diagrammatically another constructional form ofapress according to the invention, in which the sieve by which liquid ispressed out of the material The'sieves are here arranged as the mantlesof two rotatable cylinders 18, 19, between which the materials to bepressed are caused to advance in a direction parallel to the axes ofrotation of the cylinders. Also in this construction the above mentionedcondition is fulfilled, viz that the press materials must move in aninclined direction over the spaces of the sieve which are parallelbetween themselves.

The materials to be pressed are introduced with the requisite pressureinto a chamber 20 between the cylinders 18, 19 the areas of inletsand/or outlets of which may be controlled by means of a movable body 21.The cylinders 18, 19 are hollow, and their casings consist of sievesformed by bars 22 (which, as above indicated, may be substituted bydiscs) provided in the manner above described with reference to Figures13 or in any other suitable manner, so that in any case between saidbars 22 spaces 23 are formed of a desired or requisite width, flaringtowards the interior of the cylinders or not.

The liquid extracted from the pressed material is discharged from theinterior of the cylinders by means of a suitable discharging device(not-shown) and through the pipe 24 liquid or air may be introduced intothe spaces, which lead out from the chamber 20, for their blowing out orscavenging.

For obtaining the desired pressure for feeding and pressing the materialagainst the sieve any suitable device, such as a mud pump, may be used.

Figure 6 shows a modified arrangement according to which the discs 6abut at their outer ends towards a concentric wall 25 enclosing thechamber 3, in which a conveyor screw 26 presses the goods from the inlet1 to the outlet 4. Pipes 27 opening into the space 29 between the discs6 by means of branch pipes 28 are provided. As shown on a larger scalein Figure 8 the discs 6 are provided with holes 30, through which thespaces 29 are put in communication with one another and with the branchpipes 28.

Figure 7 illustrates a section of the same arrangement as shown inFigure 6, except that the discs 6 are substituted by longitudinallaminae 6 which are held in place by means of wire rings 31 or the like.The sieve elements in the form of discs or slats closely abut each otherat their ends adjacent to the press chamber. According to the fact thatthe surfaces of said rings or slats even in a well-ground condition arenot perfectly smooth, but are provided with small cavities andprojections, the spaces between said cavities and projections form smallchannels for the escape of the water pressed out from the material. Thesizes of these channels are automatically adjusted according to thepressure of the press material with the aid of overlapping surfaces ofthe sieve elements, on which the pressure acts so that the sieveelements are compressed more or less in accordance with the variationsof said pressure.

Having now particularly described and ascertained the nature of my saidinvention and in What manner the same is to be performed, I declare thatwhat I claim is 1. In a press for extracting liquid from a mass offinely divided solid material, a press chamber, means forapplyingpressure to the material therein, a plurality of movably mounted sieveelements arranged in louvre like formation inclined to the radii of thepress chamber and closely abutting on their inner edges, the spacesbetween the elements being varied inversely in accordance with thepressure applied to the material in the press chamber. 7

2. In a press for extracting liquid from a mass of finely divided solidmaterial, a press chamber, means for applying pressure to the materialtherein, a plurality of movably mounted sieve elements arranged inlouvre like formation inclined to the radii of the press chamber, andclosely abutting on their inner edges, the adjacent surfaces of saidelements converging towards one another,

nally within the press chamber, said elements 7 the spaces betweensaidelements being varied inversely in accordance with the pressure appliedto the material in the press chamber.

3. In a press for extracting liquid from a.

mass of finely divided solid material, a press chamber, means forapplying pressure to the material therein, a plurality of movablymounted sieve elements arranged in louvre like formation inclined to theradii of the press chamber and abutting but overlapping on their inneredges, the adjacent surfaces of said elements converging towards oneanother, the spaces between the elements being varied mversely inaccordance w1th the pressure applied by the material on the saidoverlapping inner edges.

4. A press as claimed in claim 1, in which the sieve elements consist ofbars longitudinally arranged within the press chamber.

5. In a press for extracting liquid from a mass of finely divided solidmaterial, a press chamber, means for applying pressure to the materialtherein, a plurality of movably mounted sieve elements in the form ofbars arranged in louvre like formation longitudis material therein, aplurality of movably mounted sieve elements in the form of bars arrangedin louvre like formation longitudinally within the press chamber andabutting on their inner edges, the adjacent surfaces of said elementsconverging towards one another whereby the spaces between the elementsmay be varied inversely in accordance with the pressure applied to thematerial in the press chamber.

7. In a press for extracting liquid from a mass of finely divided solidmaterial, a press chamber, means for applying pressure to the materialtherein, a plurality of movably mounted sieve elements in the form ofbars arranged in louvre like formation longitudinally within the presschamber and abutting but overlapping on their inner edges, the adjacentsurfaces of said elements converging towards one another the spacesbetween the elements beingvaried inversely in accordance with thepressure applied by the material on the said overlapping edges.

8. In a press for extracting liquid from a mass of finely divided solidmaterial, a press chamber, means for applying pressure to the materialto be pressed, and for making the said material abut against a sieve,which cone stitutes the limitation of said press chamher, said sieveconsisting of freely movable elements, the inner portions of which arematerial for cleaning the sieve.

brought in contact with one another by the pressure of the material.

9. In a press for extracting liquid from a mass of finely divided solidmaterial, a press chamber, means for applying pressure to the materialto be pressed, and for making said material abut against a sieve, whichconstitutes the limitation of said press chamher, said sieve consistingof freely movable I elements, which at their inner portions are broughtin contact with one another by the pressure of the material, and meansfor intermittently establishing a pressure of a fluid in oppositedirection to the pressure on the In testimony whereof I have signed myname to this specification.

HARRY SKtjLDBERG.

